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x in (-oo:+oo)
x/5 = 12/15 // - 12/15
x/5-(12/15) = 0
x/5-4/5 = 0
1/5*x-4/5 = 0 // + 4/5
1/5*x = 4/5 // : 1/5
x = 4/5/1/5
x = 4
x = 4
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